The Ideal Amount Of Sleep For The Body Has Been Determined
1- 27.08.2026, 10:48
- 1,144
Scientists attempted to derive a universal formula.
A new study challenges the long-held belief that every adult needs exactly eight hours of sleep per day—it turns out that sleep needs can vary significantly from person to person. This was reported by the New York Post.
Scientists noted that in pre-industrial societies, sleep patterns were much more flexible than they are today. For example, members of certain communities in Tanzania, Namibia, and Bolivia slept an average of 5.7 to 7.1 hours per night, waking up at first light, and did not take daytime naps to make up for the missing hours. According to another study, the average sleep duration in such communities was about 6.4 hours per day.
Experts explain this by noting that modern sleep patterns differ significantly from those inherent in human nature—primarily due to artificial lighting, which shifts the internal biological clock and causes people to go to bed later. At the same time, the actual need for sleep is determined by an individual’s physiological characteristics and overall health.
Some studies suggest that the optimal amount of sleep for the body may be between 6.4 and 7.8 hours. But there is simply no single standard that applies to absolutely everyone: for some people, 8 hours is truly enough, while others need significantly more or less.
The National Sleep Foundation continues to recommend that adults aged 26–64 get 7 to 9 hours of sleep per day, though it acknowledges that individual needs may vary within a wider range—roughly 6 to 10 hours.
There is no hard-and-fast “exactly eight hours” rule. What matters far more is the quality and regularity of sleep, as well as how a person feels after waking up. If fatigue persists even after a full eight hours of sleep, this may be a sign that the body needs more—or, conversely, less—time to rest.
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